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Presto - Base JDBC Connector

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.plugin.jdbc;

import com.facebook.presto.spi.ConnectorFactory;
import com.facebook.presto.spi.Plugin;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.inject.Module;

import java.util.List;
import java.util.Map;

import static com.google.common.base.MoreObjects.firstNonNull;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.isNullOrEmpty;
import static java.util.Objects.requireNonNull;

public class JdbcPlugin
        implements Plugin
{
    private final String name;
    private final Module module;
    private Map optionalConfig = ImmutableMap.of();

    public JdbcPlugin(String name, Module module)
    {
        checkArgument(!isNullOrEmpty(name), "name is null or empty");
        this.name = name;
        this.module = requireNonNull(module, "module is null");
    }

    @Override
    public void setOptionalConfig(Map optionalConfig)
    {
        this.optionalConfig = ImmutableMap.copyOf(requireNonNull(optionalConfig, "optionalConfig is null"));
    }

    @Override
    public  List getServices(Class type)
    {
        if (type == ConnectorFactory.class) {
            return ImmutableList.of(type.cast(new JdbcConnectorFactory(name, module, optionalConfig, getClassLoader())));
        }
        return ImmutableList.of();
    }

    private static ClassLoader getClassLoader()
    {
        return firstNonNull(Thread.currentThread().getContextClassLoader(), JdbcPlugin.class.getClassLoader());
    }
}